NET INCOME PER SHARE (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Jun. 15, 2015
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	5,099	6,804
Options
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	4,313	5,452
Non-vested restricted stock units
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	786	1,352
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Convertible Notes Payable, Noncurrent	$ 125,000		$ 125,000